It seems that you'll probably see the mood theme of the person making the post on your reading page, I can't find any settings to fix that, if you visit the entry's page or the imzy community though you will see the Imzysaurus mood icons!
Custom mood themes have to be manually set up for each journal/community that wants to use them. Here's the photobucket album that I've uploaded them to, you can then just go here to create your own Imzy theme :)
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